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  <title>以采样模式启动 XHProf 性能分析</title>
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 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.xhprof-sample-enable" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">xhprof_sample_enable</h1>
  <p class="verinfo">(PECL xhprof &gt;= 0.9.0)</p><p class="refpurpose"><span class="refname">xhprof_sample_enable</span> &mdash; <span class="dc-title">以采样模式启动 XHProf 性能分析</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.xhprof-sample-enable-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>xhprof_sample_enable</strong></span>
    ( <span class="methodparam">void</span>
   ) : <span class="type"><span class="type void">void</span></span></div>

  <p class="para rdfs-comment">
   <span class="function"><a href="xhprof_enable.html" class="function">xhprof_enable()</a></span> 的更轻量的版本，以采样模式开始性能分析。
   抽样的间隔为 0.1 秒，样本记录了完整的函数调用堆栈。
   主要使用的情况是以较低的性能开销来进行性能监控和诊断。
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-function.xhprof-sample-enable-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.xhprof-sample-enable-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   <strong><code>NULL</code></strong>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.xhprof-sample-enable-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li class="member"><span class="function"><a href="xhprof_sample_disable.html" class="function" rel="rdfs-seeAlso">xhprof_sample_disable()</a> - 停止 xhprof 性能采样分析器</span></li>
   <li class="member"><span class="function"><a href="xhprof_enable.html" class="function" rel="rdfs-seeAlso">xhprof_enable()</a> - 启动 xhprof 性能分析器</span></li>
   <li class="member"><span class="function"><a href="memory_get_usage.html" class="function" rel="rdfs-seeAlso">memory_get_usage()</a> - 返回分配给 PHP 的内存量</span></li>
   <li class="member"><span class="function"><a href="getrusage.html" class="function" rel="rdfs-seeAlso">getrusage()</a> - 获取当前资源使用状况</span></li>
  </ul>
 </div>

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